Design a thermocouple installation to measure the temperature of air flowing at a velocity of 15 m/s in a 1-m-diameter duct. The air is at approximately 1000°C and the duct walls are at 200°C. Select a type of thermocouple to use, and then determine how accurately the thermocouple measures the air temperature. Prepare a plot of the measurement error vs. air temperature and discuss the result. Use Table 1.4 to estimate the convection heat transfer coefficients. This is a multistep problem; after one has studied convection and radiation, improve this design to reduce the measurement error by orienting the thermocouple and its leads differently and using a radiation shield.

Data from in Table 1.4

Transcribed Image Text:

Air flow 15 m/s Circular cross section Leads Thermocouple 1m